Common Error Messages
Last updated
Last updated
An API call that encounters an error will return 0 as its status code and display the cause of the error under the result field.
"Missing or unsupported chainid parameter (required for v2 api), please see chainlist for the list of supported chainids"
The chain you've specified is not supported by us yet. It could also be that you've sent multiple chains at the same time like 420,10 , you can only send one at a time.
"Invalid API Key"
This error occurs when you specify an invalid API Key.
Ensure you are using your Etherscan API Key, keys from other chains like Polygonscan/Arbiscan are not valid for V2.
Keys do take a few minutes to activate, anything longer than should be alarming.
"Max rate limit reached, please use API Key for higher rate limit"
This error occurs when you exceed the rate limit assigned to your specific API key.
If you are using a script or application, apply throttling like a token bucket to limit the frequency of calls.
"Error! Missing Or invalid Action name"
This error occurs when you do not specify, or specify an invalid module and action name.
To resolve, double check your API query to use a valid module and action name.
"Error! Block number already pass"
"Error! Invalid address format"
"Contract source code not verified"
These error messages returned are specific to certain endpoints and their related parameters.
To resolve, kindly refer to the specific endpoint's documentation, and check for the correct format or values to be specified as parameters.
"Query Timeout occured. Please select a smaller result dataset"
"Unexpected err, timeout occurred or server too busy. Please try again later"
This error occurs when you have sent a particularly large query that did not manage to be completed in time.
To resolve, adhere to the of your available plan.
If you require some help getting started, try copying the sample queries provided in the and pasting them into your browser.
To resolve, consider selecting a smaller date/block range, though you may if you think the issue may be performance related.